johnson



F. E. JOHNSON.

SCREEN.

APPLICATION FILED MAY 27. 19W.

Patented Aug. 12, 1919.

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FRAN K E. JOHNSON, SALT LAKE CITY, UTAH, ASSIGNOR TO AMERICAN MANGANESESTEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE SCREEN.

Patented Aug. 12, 191%.

Application filed May 27, 1918. Serial No. 236,722.

I Salt Lake City, in the county of Salt Lake and State of Utah, haveinvented certain new and useful, Improvements in Screens,

" of which the following is a specification.

pass down thereover.

My invention refers to screens and particularly to screens for use inscreening ores and other heavy materials.

In preparing ores and the like for use in concentrators and the like, itis desirable that all the waste material be separated to as great anextent as possible before the ores and the like are delivered forfurther treatment. It is customary to permit the ores to ride down aninclined screen or slide so that the dirt, and the like will be siftedout and material delivered at the bottom sufliciently screened forfurther treatment.

It is one of the objects of my invention to provide a screen having aroughened or wavy surface which will act as means for accelerating thescreening action as the ores Another ob'ect. s to provide a screen whichis so arranged as to serve as a means for causing a jarring or bumpingof the ores and facilitating screening action.

A further object is to form a screen plate for use with ores and thelike which is made of an integral plate having a series of transverselyextending members curved in elevation and defining a plurality of screenopenings in plan.

A further object is to improve screens and Y the like for successfulcommercial operation.

I accomplish these and other objects by forming a screen platepreferably integrally, having a series of cross members defining spaces,the members in longitudinal elevation being wavy-like or curved, thusproviding a plate having a series of wavy portions on its surface. i

Referring to the drawings:

Figure 1 is a top plan view of a screen made in the preferred embodimentof my invention. a

Fig. 2 is a side elevation thereof.

Fig. 3 is a section on line 3-3 of Fig. 1, and

Fig. 4 is an enlarged sectional view on line 4.4 of Fig. 1. y I

The screen plate of my invention is made as an integral plate comprisingmarginal members 5, 6, 7 and 8, longitudinally extending members 9 andtransversely extending members 10, the various members being so cast asto define a series of regular shaped openings 11 to serve as a screen ormesh. By varying the sizes of the openings 11, screens of various sizesof mesh may be made. For securing the screen plate in position, I preferto make the marginal members 6 and 8 with flat bottoms, as shown in Fig.2, and wavy upper portions 12, providing the same with properly arrangedapertures 13 for the reception of suitable fastening means such asbolts, and the like. The longitudinal and transverse members 9, 10, arewavy-like in elevation preferably in the form of a modified sine curve,although other wavy or curve-like shapes more or less acute, may be usedif desired. The cross section of the members 9, 10, in the form shownherein is substantially that of an inverted trapezoid, as shown at 14 in'Fig. 3, but I do not wish to limit my invention to a bar having such across section as I propose to form screens having cross bars with crosssectional shapes such as circular,

square, oblong, triangular, hexagonal, or'of any other shape which maybe required to meet different conditions of use. The purpose ofproviding a screen plate having a wavy upper surface is to serve asmeans for jarring or agitating the ores and the like passing over thesurface thereof. If desired, the screensmay be set at an angle to thedirection of the travel of the ore, thus increasing the jarring oragitating action. If the ore were allowed to slide over a smooth screenthe chances are that the dirt carried on the uppermost portion of thescreen would not be sifted out as the ore because of its great weightwould move without any perceptible parting of the mass, whereas whendirected over a screen of the form of my invention, the whole mass ofore Will be agitated to such an extent as to permit all dirt, and thelike carried thereby to be sifted out and removed therefrom. 7

It will be noted that I have provided a novel screen plate for screeningheavy material such as ores, and the like, which of itself serves as ameans for agitating the mass to pass there-through, thus doing away withthe necessity of mechanical agitation to remove waste.

. Such. modifications of such a device are susceptible and I cns1der ascomlng W1th1n my invention as defined by the appended terlal beingscreened.

claims.

I claim 1. An integrally formed screen, including boundary members andintermediate members, the boundary members having undulating uppersurfaces.

2. An integrally formed screen, including boundary members andintermediate members, the boundary members having undulating uppersurfaces and straight lower surfaces.

3. An integrally formed screen, comprising a plurality of members,including boundary members, each having curved upper surfaces foragitating the material being screened.

4. An integrally formed screen, comprising a plurality of members,including boundary members, each having curved upper surfaces, ad acentmembers being curved in an opposlte manner for agitating the ma 5. Anintegrally formed screen, comprising a plurality of members, includingboundary members, each having curved upper surfaces, and a plurality oftransverse members similarly curved.

6. An integrally formed screen, comprising a plurality of members,including boundary members, the screening surfaces of Which areundulating.

7 An integrally formed screen, comprising a plurality of undulatingagitating members, including boundary members, the

agitation being caused solely by said unclulating members.

Signed at Salt Lake City,'State of Utah, this 7th day of May, A. D.1918.

' FRANK E. JOHNSON.

